Introduction: Some mineral elements and heavy metals such as cadmium and lead if consumed regularly for a long period might be quite harmful to human health. In order to investigate the effects of domestic waste water on some mineral elements and heavy metals three plants namely rapeseed, alfalfa, and spinach were selected and the experimental works were carried out at research station at Islamic Azad University, Shahr-e-Qods Branch, in the year 2011.Materials and Methods: A factorial experiment in randomized complete block design with three replications was implemented. Experimental factors including irrigation water with different degrees of pollution in four-level including the control were applied to rapeseed, alfalfa, and spinach plants.Results: The results indicated that there was significant differences between mineral elements namely potassium, phosphorus and sodium and the concentrations of these elements were highest in the plants that were irrigated with domestic waste water as compared to the control. The concentrations of cadmium and lead did not show significant differences among the sample examined.Conclusion: Irrigation with refined domestic waste water increased mineral elements such as sodium, potassium and phosphorus however significant differences were not observed among heavy.
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